I would rank the performances gorguts > carcass > the black dahlia murder > noisem, tho if I liked tbdm's music as much as I liked carcasses I would probably put them over carcass. Tbdm was the surprise of the show for me, they were the band I was least looking forward to but they put on a great live show. Trevor Strnad is a great frontman with lots of energy and crowd interaction. I don't know if I would pay for a tbdm show on its own but after that performance I would not consider them a negative on the bill. Gorguts performed flawlessly, they only issue for me was that they didn't get more time. Carcass were great, lots of energy for a couple of old blokes. Noisem's set was solid, they were obviously less polished than the other bands there and the lack of experience showed in their live set. There is something to be said for their balls to the wall energy though.
Edit: forgot to mention I got to shake Luc Lemay's hand. Coolest shit ever.